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Old 2nd January 2004, 04:27 PM   #1
Tensop is offline Tensop  Lebanon
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Default I had an amp die a few years ago.. anyone able to uncover why?

Hi guys.. only recently(over the last year or so) have i become interested in audio. A few years ago i had an amplifier that died(2 channel 60 watt/8 ohm sansui amp - was pretty old, probably late 80s.' one day i came home to find that a speaker terminal was shorted, the speaker fuses didnt blow but the mains fuse did. it had overheated. i no longer have the amp but does anyone have an idea why it died? could the output transistors/other transistors have internally fused themself?
Every time i replaced the fuse it blew it instantly

thanks, tensop.
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Old 2nd January 2004, 04:33 PM   #2
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Seems mostly like one or more output transistors had shortend...
This could be because of age or over heating
Free Schematic and Service Manual downloads www.audio-circuit.dk, Spare time company (just for fun): www.dupont-audio.com
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Old 2nd January 2004, 08:58 PM   #3
lucpes is offline lucpes  Romania
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If a amplifier speaker terminal is shorted and the amplifier does not have a protection circuit for this, then usually the output transistors blow first, protecting the fuse The fuse blows too, but seconds later.
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Old 2nd January 2004, 10:19 PM   #4
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In many japanese amps are used fusible resistors at critical positions - try if any is not interrupt.
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